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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ee01d02a01821c5c968702191d936f12497c1dda4af77693bb40dfb3b09f25' 
  AND token = 'bVaH842EsVBTGsk9f5k133jLCrCufGAQ7FdE366T4ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}